Bb Altered Scale

What is the Bb Altered Scale?

The altered scale (also called Super Locrian) is the seventh mode of the melodic minor scale, and it lives up to its name — every possible tension is altered (♭9, #9, ♭5/#11, #5/♭13). It's the ultimate dominant tension scale in jazz, used over V7 chords when you want maximum harmonic tension before resolving. Here's how the Bb Altered Scale lays out on the fretboard. This scale is enharmonically equivalent to A# Altered.

Notes and Positions

All altered tensions over V7; 7th mode of melodic minor. On bass, this scale becomes a toolkit for strong roots, passing tones, and melodic fills that still support the groove. Think in root-on-E and root-on-A boxes, then adapt the same notes for 5-string bass when the low B string gives you another root below the pattern. In the key of Bb, the notes are: Bb, Cb, C#, D, E, Gb, Ab.

How to Use It

You'll often hear it in Jazz, Fusion, and Altered dominant chords. A good way to internalize the sound is to sing the root, then sing a few scale degrees before you play them.

Loop a simple drum groove and keep every note locked to the subdivision before adding fills. Use the interactive fretboard above to spot repeats of the same note on different strings and frets.